Arduino-湿度传感器..doc

Arduino - 湿度传感器在本节中,我们将学习如何使不同的传感器连接我们的 Arduino 板。 我们将讨论以 下传感器 -湿度传感器(DHT22温度传感器(LM35检测传感器(简单触发PIR 传感器超声波传感器GPS湿度传感器 (DHT22DHT-22(也称为 AM2302 是个数字输出,相对湿度和温度传感器。 它使电容式湿 度传感器和热敏电阻测量周围空,并在数据引脚上发送数字信号。在本例中,您将了解如何将此传感器与 Arduino UNO起使。 室温和湿度将打印到 串监视器上。DHT-22 传感器连接很简单。 左边的第个引脚为 3-5V 电源,第个引脚连接到数据输引脚,最右 边的引脚连接到地。技术细节电源 - 3-5V最电流 - 2.5mA湿度 - 0-100%,精确度为 2-5%温度 - 40 80C,精度为 0.5C必需的组件您将需要以下组件 -1 Breadboard 包板1 Arduino Uno R31 DHT221 10K欧姆电阻程序 按照电路图并挂接包板上的组件,如下图所。草图在计算机上打开 Arduino IDE软件。 在 Arduino 语编码将控制你的电路。 通过单击新 建打开个新的草图件。Arduino 代码/ Example testing sketch for various DHT humidity/temperature sens #include DHT.h#define DHTPIN 2 / what digital pin were connected to/ Uncomment whatever type youre using!/#define DHTTYPE DHT11 / DHT 11#define DHTTYPE DHT22 / DHT 22 (AM2302, AM2321/#define DHTTYPE DHT21 / DHT 21 (AM2301/ Connect pin 1 (on the left of the sensor to +5V/ NOTE: If using a board with 3.3V logic like an Arduino Due conne / to 3.3V instead of 5V!/ Connect pin 2 of the sensor to whatever your DHTPIN is/ Connect pin 4 (on the right of the sensor to GROUND/ Connect a 10K resistor from pin 2 (data to pin 1 (power of the / Initialize DHT sensor./ Note that older versions of this library took an optional third / tweak the timings for faster processors. This parameter is no lo / as the current DHT reading algorithm adjusts itself to work on f DHT dht(DHTPIN, DHTTYPE;void setup( Serial.begin(9600;Serial.println(DHTxx test!;dht.begin(;void loop( delay(2000; / Wait a few seconds between measurementsfloat h = dht.readHumidity(;/ Reading temperature or humidity takes about 250 milliseconds! float t = dht.readTemperature(;/ Read temperature as Celsius (the defaultfloat f = dht.readTemperature(true;/ Read temperature as Fahrenheit (isFahrenheit = true/ Check if any reads failed and exit early (to try again. if (isnan(h | isnan(t | isnan(f Serial.println(Failed to read from DHT sensor!;return;/ Compute heat index in Fahrenheit (the defaultfloat hif = puteHeatIndex(f, h;/ Compute heat index in Celsius (isFahreheit = falsefloat hic = puteHeatIndex(t, h, false;Serial.print (Humidity: ;Serial.print (h;Serial.print ( %t;Serial.print (Temperature: ;Serial.print (t;Serial.print ( *C ;Serial.print (f;Serial.print ( *Ft;Serial.print (Heat index: ;Serial.print (hic;Serial.print ( *C ;Serial.print (hif;Serial.println ( *F;代码说明DHT22传感器具有四个端 (V cc, DATA , NC , GND ,它们连接到电路板,如下 : DATA 引脚连接到 Arduino 引脚号 2Vcc 引脚到 5伏的 Arduino 板GND 引脚连接到 Arduino 板的地我们需要在 DATA 和 Vcc 引脚之间连接 10k 欧姆电阻(上拉电阻旦硬件连接完